When running the dawes or enterprise in stand alone you are very reliant on keeping boost within limits depending on state of tune.
Stock cars are a pain as most want to push harder than 20 psi, also the chipit tunes (Out of the box) leave overboost protection mapped in so if pushed hard they will code. I have custom tunes that overcome limits but can cause clutch slip with the savage ramp up.
As for SRB, his cannot see overboost if he has (What I label bomb proof) tune loaded I sent some time ago.
Not possible. His tune is very mild due to nature of what he's been doing. Around tune 4 in old talk.
The ramp controller is very sensitive so others may be experiencing underboost if only 16psi or as covered below, the valve may not be seating as should. This is very important.
Boost discrepancy with MN will not always go into limp mode but does normally disable the boost solenoid. If the said solenoid is bypassed, this will not be apparent.
Interestingly, mine has never faulted to date and I have done things out of limits too.
Another thought is, a failed T (Holed) piece in the map line.
Any having issues for what ever reason, 100% close the ramp, reconnect the boost solenoid and see if settles down.
Other trick is, if any carbon etc gets in the valve they can leak off. This can be checked with compressed air and a regulator. It should make a burp sound at set boost (say 22 psi for example).
If a hissing is heard from lower levels it is not seating.
Remove the top gland and inspect for carbon etc, clean as necessary then fit the ball and bump with a soft drift to bed it back in.
You can then test this by (This sound wrong
) sucking on the lower barb by some means (Most use mouth) If it wont make a vacuum, you have a poor seal at the ball valve so clout it a bit harder so beds in again. The ball is very tough to takes a reasonable hit.
Other point is, it's very difficult for me remotely setting these up as every vehicle is different so some may not be dot on. The not tuned vehicles are most difficult as boost must be kept under 22 psi.
Regards T